Cataloguing Books on-line

Hey fellow campers, i've just discovered Library Thing - an on-line book-cataloguing site. You get to catalogue 200 books for free after which you have to pay $10 a year or $25 for life - given the price of many softwares, it's a pretty good deal. And many of you know what a book geek i am. The thing about this site is that you can view other people's libraries. In theory it's a way of sharing libraries, swapping books and such. Though i'm pretty protective of my collection - again, as many of you know. Nonetheless i like sharing and a couple of dozen of my books are abroad in the world at any one time.